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Infections

Safety of voriconazole and sirolimus coadministration after allogeneic hematopoietic SCT

Abstract

Antifungal prophylaxis with azoles is considered standard in allogeneic hematopoietic SCT (allo-HSCT). Although sirolimus is being used increasingly for the prevention of GVHD, it is a substrate of CYP3A4, which is inhibited by voriconazole, and concurrent administration can lead to significantly increased exposure to sirolimus. We identified 67 patients with hematologic malignancies who underwent allo-HSCT with sirolimus, tacrolimus and low-dose MTX and received concomitant voriconazole prophylaxis from April 2008 to June 2011. All patients underwent a non-myeloablative or reduced-intensity conditioned allo-HSCT. Patients received sirolimus and voriconazole concurrently for a median of 113 days. The median daily dose reduction of sirolimus at the start of coadministration was 90%. The median serum sirolimus trough levels before and at steady state of coadministration were 5.8 ng/mL (range: 0–47.6) and 6.1 ng/mL (range: 1–14.2) (P=0.45), respectively. One patient with an average sirolimus level of 6 ng/mL developed sirolimus-related thrombotic microangiopathy that resolved after sirolimus discontinuation. No sinusoidal obstructive syndrome was reported. Seventeen patients (25%) prematurely discontinued voriconazole because of the adverse events. Only two patients (3%) presented with possible invasive fungal infections at day 100. We demonstrate that sirolimus and voriconazole coadministration with an empiric 90% sirolimus dose reduction and close monitoring of sirolimus trough levels is safe and well tolerated.

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Acknowledgements

We gratefully acknowledge the expert care provided to our patients by the fellows, physician assistants, nurse practitioners and nurses of Memorial Sloan Kettering Cancer Center.

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Correspondence to I Ceberio or M-A Perales.

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Competing interests

IC received research support from Pfizer Spain. M-AP has served on advisory boards for Astellas and Merck. The remaining authors declare no conflict of interest.

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Ceberio, I., Dai, K., Devlin, S. et al. Safety of voriconazole and sirolimus coadministration after allogeneic hematopoietic SCT. Bone Marrow Transplant 50, 438–443 (2015). https://doi.org/10.1038/bmt.2014.286

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